Indeed, you should not rename tables directly in the database. Is there any specific reason for you to rename it?

As you have figured out already, the application is mapped to use the CONTACT1 table as the table for that entity. As far as I know, you cannot change the table names directly in Service Studio, sadly. The table names are internal names.

However, if you really don't want to change the table name back to its original name, I'll encourage you to get in touch with out support team, since they are the best people to let you know what the best options are - if any - for you to keep the table with the new name.

I was on a test environment, that's the only reason why I want to change the table name. I was trying to find out how could I relate an Entity to an existing table.
Outsystems can only work with tables generated by itself?